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PBS
Pbs Kids: Plum Landing: Clouds or Shadows
This interactive is based on the PBS Kids' series, Plum Landing. Students will read informational text about clouds and shadows. Then they will make observations about them and draw these on the site.
NOAA
Noaa: Tornado in a Bottle [Pdf]
Find facts about tornadoes and see an actual vortex after making a tornado in a bottle with some common materials.